Nut guard



Patented Mar. 24, 1925.

I.PATENT OFFICE.

J'E C. ROBINSON, 0F DETROIT, MICHIGAN.

NUT GUARD.

Application mea July 1s, 192s.. serial m. 652,557.

To all whomv t may camera.'

Be it known that I. JOE C. ROBINSON, a citizen of the United States ofAmerica, residin at Detroit, .in the county of Wayne and gtate ofMichigan, have invented certain new and useful Improvements in NutGuards, of which the following is a specication, reference being hadtherein to the 'accompanying drawings.

This invention relates to a nut guard'that may be mounted on a nut to'preventa wrench or similar tool from beingl used to rotate a nut.

The main .objects of my invention are security against theft;adaptability for use upon articles of various thickness; compactness,and simplicity of construction.

The uses of the nut guard are many but it has been especially designedto prevent removal of the nuts employed for holding the locking lugs ofa tire rim on a wheel rim or felly, .so that the tire rim and a tirecar-l ried thereby cannot be surreptitiously re moved. It may also beused for guarding the nut employed for retaining a spare rim and tire ona tire guard.

The construction of the nut guard will be hereinafter specificallydescribed'and then claimed, and reference will nowbe had to the drawing,wherein- Figure 1 is a longitudinal sectional view of the nut guard on anut supported from a wheel felly;

Fig. 2 is a front elevation of the nut guard patly broken away andpartly in` section, an Y. 4

Fig. 3 is a cross sectional view taken on the line III-III of Fig. 1. Inthe drawing, 1 denotes 4va bolt and screwed on the bolt is a nut 2havingfacets 3. Adjacent the inner end of the nut 2 is an annular groove 4. I

5 denotes a cylindrical housing adapted to be placed over the nut 2 tofreely revolve about the facets or axis of the nut and at one side ofthe housing 5 is a 'casing 6 provided with a longitudinal bore 7communieating with a bore 8 at a right angle to the bore 7 and the innerend of the bore 8 com.

housing a 10 denotes a plunger slidable in the bore 8, said plungerhaving its 'inner end cut away to provide a tooth 11 which extends intothe groove 4 of the nut 2 and prevents longi-l tudinal movement of thehousing 5 on said mit. but does not interfere with shifting of thehousing 5 about the axis of the nut.

12 denotes a coiled expansionA spring in the bore 8 between the outerend of the plunger 10 and the plate 9, and the expansive force of thisspring retains the tooth 11 of the plunger normally in the groove 4 ofthe nut 2.

13 generally denotes aeonventional form of key actuated lock mechanismlocated within the bore 7 and said lock mechanism may include anoscillatory barrel retained within the bore 7 hv a pin 14 with the innerend of the barrel provided with a. crank pin 15 normally extending intoa recess 16 provided therefor in the side of the plunger 10. When thelock barrel is oscillated by a key inserted inthe outer end of saidbarrel the crank pin 15 retracts the plunger 10.'against ,the action ofthe spring 12. to permit of the housing 5 being removed from the nut 2.

With the housing 5 free to swing or revolvel relative to the nut 2 it isobvious that a'wrench or similar tool cannot he employed to rotate thenut 2 with the housing 5 thereon. The nut is therefore guarded againstsurreptitious removal from the bolt-1, and as illustrating my inventionas security against theft of a tire rim 17, the bolt 1 extends through awheel felly or rim 18 and a rim holding clip or lugl 19. With the nut 2clamping the clip or lug 19 against the rim or felly 18 itis obviousthat the tire riml 17 cannot be removed until the nut 2 is removed fromthe bolt. Such cannot be accomplished to be understood that thestructural elements 4 are susceptible to such changes as fall within thescope of the appended claim.

What I claim is f A nut pted to inclose a nut and freely dguardcomprising a cylindricalI shift relative to the axis of the nut, a locklock mechanism in said casing adapted for casing carried by saidhousing, a spring retracting said plunger relative to the nut. l'pressed plunger slidablein said casing and In testimony whereof I aix mysignature extending` into said nut and adapted to move in presence oftwo Witnesses.

about in the exterior Walls of said nut when J OE C. ROBINSON. saidguard is shifted oireumferentially of the nut, said plunger preventingendwise movement of said guard, and key actuated Witnesses:

KARL H. BUTLER, ANNA M. DoRR.

